<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>01_原型</title>
</head>

<body>
    <script type="text/javascript">
        console.log(Date.prototype, typeof Date.prototype);
        function fun() {

        }
        console.log(fun.prototype);
        fun.prototype.test = function () {
            console.log('test');
        }
        console.log(fun.prototype);

        console.log(Date.prototype.constructor === Date);
        console.log(fun.prototype.constructor === fun);
    </script>
</body>

</html>